The earlier posts in this thread conclude that for the reasons stated, throttle float etc., the rpms do not drop quickly enough after releasing the clutch in first gear. That would mean the clunk is caused by the rpms being too high for the smooth transition to second. This is supported by those who say going from first to third works smoothly. Later posts say increase the rpms before shifting, which would seem to make the problem worse.
Because the car has 6 speeds, the gearing is close together, so the cars momentum together with the rpms not dropping quickly enough contributes to second being too low a gear for the car in that situation - third works better. Under hard acceleration the car "needs" second and the problem goes away. The car has so much power it doesn't "need" 6 gears for slow, in traffic, driving.
I think if you tried to drive a formula one car in heavy traffic, the same thing would happen ( if they had manual transmissions).
Maybe the first to third in slow traffic is the answer??
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